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Evaporation Removal of Boron in Molten Silicon Using Reactive Fluxes

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Book cover Energy Technology 2017

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

In order to optimize the B removal during slag-refining process for solar-grade silicon production, a new process for the removal of B in molten Si was proposed based on the principle of oxidized chlorination and evaporation. B can be generated and evaporated in the form of B-containing gas (BOCl) from molten Si using CaO–SiO2–CaCl2 slag system. Compared with the binary systems of CaO–CaCl2 and SiO2–CaCl2 slag, the ternary slag system CaO–SiO2–CaCl2 showed a better potential (90 pct) for B removal at 1723 K for 2 h. Moreover, the diffusion coefficient (D) of B in the slag was also determined using tube-molten pool method. Through this, it was found that the rate-limiting step of B-removal in the slag refining process is controlled by B transfer in the slag interface and surface.

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Author information

Authors and Affiliations

  1. Department of Metallurgical Engineering, School of Chemical Engineering, Sichuan University, Chengdu, China

    Ye Wang

  2. Department of Materials Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo City, Japan

    Kazuki Morita

Authors
  1. Ye Wang
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  2. Kazuki Morita
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Corresponding author

Correspondence to Ye Wang .

Editor information

Editors and Affiliations

  1. University of Alaska System , Fairbanks, Alaska, USA

    Lei Zhang

  2. 512 Minerals & Matls Engg Bldg, Michigan Technological Univ 512 Minerals & Matls Engg Bldg, Houghton, Michigan, USA

    Jaroslaw W. Drelich

  3. IND LLC , South Jordan, Utah, USA

    Neale R. Neelameggham

  4. Idaho National Laboratory , Idaho Falls, Idaho, USA

    Donna Post Guillen

  5. CSIRO , Canberra, Australia

    Nawshad Haque

  6. Carnegie Mellon University , Pittsburgh, USA

    Jingxi Zhu

  7. Queensland University of Technology , Brisbane, Australia

    Ziqi Sun

  8. Nucor Steel , Manila, Arkansas, USA

    Tao Wang

  9. Purdue University , West Lafayette, Indiana, USA

    John A Howarter

  10. Turku, Finland

    Fiseha Tesfaye

  11. Department of Basic Sciences/Physic, Al Isra University Department of Basic Sciences/Physic, Amman, Jordan

    Shadia Ikhmayies

  12. Massachusetts Institute of Technology , Cambridge, Massachusetts, USA

    Elsa Olivetti

  13. Proval Partners SA , Lausanne, Switzerland

    Mark William Kennedy

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© 2017 The Minerals, Metals & Materials Society

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Wang, Y., Morita, K. (2017). Evaporation Removal of Boron in Molten Silicon Using Reactive Fluxes. In: Zhang, L., et al. Energy Technology 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-52192-3_36

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